<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>更新时的一个问题</title>
    <script src="../js/vue.js"></script>
  </head>

  <body>
    <div id="root">
      <h2>人员列表</h2>
      <button @click="updataMei">更新马冬梅的信息</button>
      <ul>
        <li v-for="p in persons" :key="p.id">{{p.name}}-{{p.age}}-{{p.sex}}</li>
      </ul>
    </div>
  </body>
  <script>
    Vue.config.productionTip = false;

    const vm = new Vue({
      el: "#root",
      data: {
        persons: [
          { id: "001", name: "马冬梅", age: 36, sex: "女" },
          { id: "002", name: "周冬雨", age: 47, sex: "女" },
          { id: "003", name: "周杰伦", age: 27, sex: "男" },
          { id: "004", name: "温兆伦", age: 57, sex: "男" },
        ],
      },
      methods: {
        updataMei() {
          // this.persons[0].name = '马老师';// 奏效
          // this.persons[0].age = 50;// 奏效
          // this.persons[0].sex = '男';// 奏效
          // this.persons[0] = { id: '001', name: '马老师', age: 50, sex: '男' };// 不奏效
          console.log(this.persons.splice === Array.prototype.splice); // false
          // 包裹  这里的函数已经不是原生的了，在调用原生api的基础上还做了视图更新
          this.persons.splice(0, 1, {
            id: "001",
            name: "马老师",
            age: 50,
            sex: "男",
          }); // 奏效
        },
      },
    });
  </script>
</html>
